Lesbian Sister 

A female sibling who is acustomed to liking women. this attraction eventually developes into an obsession, and the now lesbian female is unable to be stopped

i fucking hate my lesbian sister

Lesbian Sister by Sam June 10, 2002

Sister Lesbians 

Two women who are either lesbians, or sisters, or both. It is often times difficult to determine which.

- Yo, why are those two girls holding hands on a cruise together?

- Dude, they're sister lesbians!

Sister Lesbians by Ndubya March 23, 2010

Lesbianister 

Where one lesbian is determined to turn a straight person gay, this is in an obvious way that the other person is clearly aware of.
It is often used among joking conversation as an insult between females.

Oh my god your such a lesbianister, please stop it.

Lesbianister by dizzyc September 14, 2010